What’s Happening Under Your Skin?

When you get a pimple, there’s actually a lot happening beneath the surface.

🧴 1. Your oil gland gets busy

Deep inside your skin, tiny sebaceous glands produce oil called sebum. Hormones can cause these glands to produce more oil than usual.

🚪 2. The follicle gets clogged

Your skin constantly sheds dead cells. Sometimes these cells mix with excess oil and become trapped inside a hair follicle.

This creates a tiny blockage called a microcomedone—often the beginning of an acne lesion.

🦠 3. Microbes interact with the clogged follicle

The bacterium Cutibacterium acnes naturally lives on your skin. In an oily, clogged follicle, it can contribute to the inflammatory process.

🔥 4. Your immune system responds

Your body detects the changes inside the follicle and activates an immune response.

Inflammation develops under the skin, causing:

• Redness
• Swelling
• Warmth
• Tenderness or pain

💥 5. The follicle can rupture

If pressure and inflammation become severe, the follicle wall can break. Its contents spill into the surrounding skin, triggering even more inflammation.

That’s when a relatively small blockage can turn into a deep, painful nodule and potentially leave a scar.

🧠 The surprising part

A pimple can start forming before you can see it.

The earliest lesion—the microcomedone—is microscopic. By the time a red bump appears on your face, the underlying process may already have been developing for some time.

The simple picture

More oil → clogged follicle → microbial interaction → inflammation → visible acne

So when you look at a pimple in the mirror, you’re really seeing the surface expression of a process happening underneath your skin.